White-Rodgers 90-T40M2 Transformer

When you're servicing commercial rooftop units or residential air handlers that require a reliable 24V control circuit, the White-Rodgers 90-T40M2 is a standard-issue 40VA control transformer that handles the load without breaking a sweat. This Class 2 energy limiting device is engineered for versatility, offering dual 208/240V primary taps to match the line voltage found in most light commercial and residential HVAC applications. The 24V secondary output provides a steady 1.67A to power thermostats, contactors, and relays, ensuring the control string remains stable during peak cycling. Designed with a multi-mount installation footprint, it includes a 4" x 4" universal mounting plate and closed-construction housing, making it a direct-fit replacement for older foot-mount or plate-mount units. The 11-inch color-coded leads are pre-stripped, saving you prep time on the job site. Using this 208/240V to 24V transformer ensures your installation meets UL standards for safety while providing the necessary VA capacity for modern high-efficiency systems.

• Flexible Primary Inputs: Features internal wiring for 208V and 240V configurations, allowing for broad equipment compatibility across different job sites.
• Simplified Installation: The included universal mounting plate and multi-mount design adapt to various enclosure sizes and orientations.
• Durable Construction: Closed-style housing protects internal windings from debris and physical impact, ensuring long-term performance in demanding mechanical rooms.
• Class 2 Compliance: Specifically designed to meet energy-limiting standards, protecting downstream low-voltage components from overcurrent.

What is the VA rating for the 90-T40M2?
This transformer is rated at 40VA, which is the standard capacity for most residential and light commercial HVAC control circuits, including those with multiple relays or contactors.

How do I wire a 208/240V primary transformer?
The primary side uses color-coded leads: typically Black (Common), Red (208V), and Orange (240V). You must cap the unused lead to prevent short circuits and ensure proper voltage reduction to the 24V secondary.

Can this transformer replace a 30VA unit?
Yes, you can safely upgrade a 30VA transformer to a 40VA unit like the 90-T40M2 to provide additional overhead for the control circuit, provided the secondary voltage matches.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.